Think It! Make it! Invent!
The 74HC20; 74HCT20 is a dual 4-input NAND gate. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
For 74HC20: CMOS level
For 74HCT20: TTL level
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Specified from 40 C to +80 C and from 40 C to +125 C.